Table 1.--Production of silvery pig iron, ferrosilicon and silicon metal in the United States (Metric tons gross weight) ---------------------------------------------------------------------------- Material and percent silicon content -------------------------------------------------------------------- Miscel- Silvery laneous pig Silicon silicon iron Ferrosilicon1/ metal2/ alloys3/ ------------- -------------------------- ---------- ---------- Year 5% to 24% 24% to 55% 56% to 95% 96% to 99% 32% to 65% ---------------------------------------------------------------------------- 19694/ 5/196,484 6/422,771 126,303 91,526 33,405 19704/ W 384,441 135,460 98,893 50,771 19714/ W 362,487 147,326 97,438 54,651 1972 W 446,305 162,134 105,575 60,845 1973 W 462,571 172,730 121,134 82,828 1974 W 426,391 201,460 127,461 92,822 1975 W 420,085 116,349 93,473 70,954 1976 W 475,806 116,620 128,473 81,755 1977 W 469,270 120,469 113,099 94,052 1978 W 447,802 148,860 109,436 101,447 1979 W 511,981 161,000 134,085 88,940 1980 W 410,159 109,265 117,597 66,087 1981 W 424,125 84,090 119,003 64,273 1982 W 211,075 68,632 70,433 45,749 1983 W 215,720 72,638 112,130 47,345 1984 W 312,354 117,053 130,639 71,405 1985 W 317,053 82,595 111,391 59,337 1986 W 232,072 59,327 114,274 55,004 1987 W 283,341 43,167 136,150 66,701 1988 W 365,181 80,254 149,662 70,545 1989 W 342,892 124,822 139,950 82,156 1990 W 321,385 109,566 145,744 72,442 ---------------------------------------------------------------------------- W Withheld to avoid disclosing company proprietary data. 1/Includes briquets. 2/Exclusive of semiconductor grades. 3/Exclusive of silicomanganese. 4/Excludes ferrosilicon used to make other silicon alloys. 5/Material classified as 5% to 20% silicon content. 6/Material classified as 21% to 55% silicon content.